Non-contact thickness measurement using UTG

Details Non-contact thickness measurement using UTG Non-contact thickness measurement using UTG

1993-07-08

1996-12-17

O'Shea, Sandra L.

Measuring and testing

Vibration

By mechanical waves

73617, 73644, G01N 2910, G01N 2922

Patent

active

055855636

ABSTRACT:
A measurement structure for determining the thickness of a specimen without mechanical contact but instead employing ultrasonic waves including an ultrasonic transducer and an ultrasonic delay line connected to the transducer by a retainer or collar. The specimen, whose thickness is to be measured, is positioned below the delay line. On the upper surface of the specimen a medium such as a drop of water is disposed which functions to couple the ultrasonic waves from the delay line to the specimen. A receiver device, which may be an ultrasonic thickness gauge, receives reflected ultrasonic waves reflected from the upper and lower surface of the specimen and determines the thickness of the specimen based on the time spacing of the reflected waves.

REFERENCES:
patent: 2697936 (1954-12-01), Farrow
patent: 3529465 (1970-09-01), Kleesattel et al.
patent: 3596505 (1971-08-01), Zeutschel
patent: 3690154 (1972-09-01), Wells et al.
patent: 3747398 (1973-07-01), Rathburn et al.
patent: 4898034 (1990-02-01), Kupperman et al.
patent: 5009103 (1991-04-01), Sato et al.
patent: 5271274 (1993-12-01), Khuri-Yakub et al.

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